How to decide 2 or 3 frozen embryos to transfer

Found out 1st IVF didn't work. Now on to doing frozen transfer. We have 6 embryos frozen. Was told today that one of those was in its hatching phase so that is good. Dr. said that most will transfer 2 or 3. Really don't want triplets but after having 2 transferred this last time with it not working I'm now wondering what to do. Hubby says 2 so that is probably what we will do. I just went online and it looks like frozen transfer is only 20-30%??? Is that what you've all heard? That just seems so low.
Now waiting for period so can start birth control pills again. Also was told I will be taking Viagra suppositories every 6 hrs for 1-2 weeks-never heard of that-anyone else doing this? Supposed to bring blood flow to the uterus.
Also after transfer I heard to eat pineapple-any other suggestions? Doing accupuncture and have cut out caffiene.

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